I could audit you could audit she could audit we could audit you could audit they could audit
V-ing form
I could be auditing you could be auditing she could be auditing we could be auditing you could be auditing they could be auditing
Perfect
I could have audited you could have audited she could have audited we could have audited you could have audited they could have audited
V-ing perfect
I could have been auditing you could have been auditing she could have been auditing we could have been auditing you could have been auditing they could have been auditing
Negation
Simple form
I couldn't audit you couldn't audit she couldn't audit we couldn't audit you couldn't audit they couldn't audit
V-ing form
I couldn't be auditing you couldn't be auditing she couldn't be auditing we couldn't be auditing you couldn't be auditing they couldn't be auditing
Perfect
I couldn't have audited you couldn't have audited she couldn't have audited we couldn't have audited you couldn't have audited they couldn't have audited
V-ing perfect
I couldn't have been auditing you couldn't have been auditing she couldn't have been auditing we couldn't have been auditing you couldn't have been auditing they couldn't have been auditing
Interrogative form
Simple form
could I audit? could you audit? could she audit? could we audit? could you audit? could they audit?
V-ing form
could I be auditing? could you be auditing? could she be auditing? could we be auditing? could you be auditing? could they be auditing?
Perfect
could I have audited? could you have audited? could she have audited? could we have audited? could you have audited? could they have audited?
V-ing perfect
could I have been auditing? could you have been auditing? could she have been auditing? could we have been auditing? could you have been auditing? could they have been auditing?
Interro-negative form
Simple form
couldn't I audit? couldn't you audit? couldn't she audit? couldn't we audit? couldn't you audit? couldn't they audit?
V-ing form
couldn't I be auditing? couldn't you be auditing? couldn't she be auditing? couldn't we be auditing? couldn't you be auditing? couldn't they be auditing?
Perfect
couldn't I have audited? couldn't you have audited? couldn't she have audited? couldn't we have audited? couldn't you have audited? couldn't they have audited?
V-ing perfect
couldn't I have been auditing? couldn't you have been auditing? couldn't she have been auditing? couldn't we have been auditing? couldn't you have been auditing? couldn't they have been auditing?